Tucanoan languages

East Tukano (nuclear green), Central Tukano (turquoise green) and West Tukano (dark green). Dots indicate current locations of the various languages. Shaded areas indicate their extents before the 20th century.

Campbell, Lyle. (1997). American Indian languages: The historical linguistics of Native America. New York: Oxford University Press. ISBN0-19-509427-1.

Kaufman, Terrence. (1990). Language history in South America: What we know and how to know more. In D. L. Payne (Ed.), Amazonian linguistics: Studies in lowland South American languages (pp. 13–67). Austin: University of Texas Press. ISBN0-292-70414-3.